package com.fh.util;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.HashMap;
import java.util.Map;
import java.util.Random;
import java.util.Scanner;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
public class EncryptUtil {
	/**
	      * 编码格式
	      */
	     private static final String ENCODING = "UTF-8";
	     /**
	      * 加密算法
	      */
	     public static final String KEY_ALGORITHM = "AES";
	     /**
	      * 签名算法
	      */
	     public static final String SIGN_ALGORITHMS = "SHA1PRNG";
	     /**
	      * 签名算法
	      */
	     public static final String key = "123456";
	 
	     /**
	      * 加密
	      *
	      * @param content 待加密内容
	     * @param key     加密的密钥
	      * @return
	      */
	     public static String AESEncode(String content) {
	    	 StringBuffer sb = new StringBuffer();
	         try {
	             KeyGenerator kgen = KeyGenerator.getInstance(KEY_ALGORITHM);
	             SecureRandom random = SecureRandom.getInstance(SIGN_ALGORITHMS);
	             random.setSeed(key.getBytes(ENCODING));
	             kgen.init(128, random);
	             SecretKey secretKey = kgen.generateKey();
	             byte[] enCodeFormat = secretKey.getEncoded();
	             SecretKeySpec secretKeySpec = new SecretKeySpec(enCodeFormat, KEY_ALGORITHM);
	             Cipher cipher = Cipher.getInstance(KEY_ALGORITHM);
	             byte[] byteContent = content.getBytes(ENCODING);
	             cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec);
	             byte[] byteRresult = cipher.doFinal(byteContent);
	             
	             for (int i = 0; i < byteRresult.length; i++) {
	                 String hex = Integer.toHexString(byteRresult[i] & 0xFF);
	                 if (hex.length() == 1) hex = '0' + hex;
	                 sb.append(hex.toUpperCase());
	             }
	             
	         } catch (Exception e) {
	             e.toString();
	         }
	         return sb.toString();
	     }
	 
	     /**
	      * 解密
	      *
	      * @param content 待解密内容
	      * @param key     解密的密钥
	      * @return
	      */
	     public static String AESDncode(String content) {
	         if (content.length() < 1) return null;
	         byte[] byteRresult = new byte[content.length() / 2];
	         for (int i = 0; i < content.length() / 2; i++) {
	             int high = Integer.parseInt(content.substring(i * 2, i * 2 + 1), 16);
	             int low = Integer.parseInt(content.substring(i * 2 + 1, i * 2 + 2), 16);
	            byteRresult[i] = (byte) (high * 16 + low);
	         }
	         try {
	             KeyGenerator kgen = KeyGenerator.getInstance(KEY_ALGORITHM);
	             SecureRandom random = SecureRandom.getInstance(SIGN_ALGORITHMS);
	             random.setSeed(key.getBytes(ENCODING));
	             kgen.init(128, random);
	             SecretKey secretKey = kgen.generateKey();
	             byte[] enCodeFormat = secretKey.getEncoded();
	             SecretKeySpec secretKeySpec = new SecretKeySpec(enCodeFormat, KEY_ALGORITHM);
	             Cipher cipher = Cipher.getInstance(KEY_ALGORITHM);
	             cipher.init(Cipher.DECRYPT_MODE, secretKeySpec);
	             byte[] result = cipher.doFinal(byteRresult);
	             return new String(result, ENCODING);
	         } catch (Exception e) {
	            e.toString();
	         }
	         return null;
	     }
	     
	     
	     
	     @SuppressWarnings("unused")
	 	private static char[] base64EncodeChars = new char[] { 'A', 'B', 'C', 'D',
	 			'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q',
	 			'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd',
	 			'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q',
	 			'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3',
	 			'4', '5', '6', '7', '8', '9', '+', '/', };
	 	 
	 	private static byte[] base64DecodeChars = new byte[] { -1, -1, -1, -1, -1,
	 			-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
	 			-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
	 			-1, -1, -1, -1, 62, -1, -1, -1, 63, 52, 53, 54, 55, 56, 57, 58, 59,
	 			60, 61, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
	 			10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1,
	 			-1, -1, -1, -1, -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37,
	 			38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1,
	 			-1, -1 };

	 	public static byte[] decode(String str) {
	 		String strc = str.substring(2, str.length()-2);
	 		byte[] data = strc.getBytes();
	 		int len = data.length;
	 		ByteArrayOutputStream buf = new ByteArrayOutputStream(len);
	 		int i = 0;
	 		int b1, b2, b3, b4;
	 	 
	 		while (i < len) {
	 			do {
	 				b1 = base64DecodeChars[data[i++]];
	 			} while (i < len && b1 == -1);
	 			if (b1 == -1) {
	 				break;
	 			}
	 	 
	 			do {
	 				b2 = base64DecodeChars[data[i++]];
	 			} while (i < len && b2 == -1);
	 			if (b2 == -1) {
	 				break;
	 			}
	 			buf.write((int) ((b1 << 2) | ((b2 & 0x30) >>> 4)));
	 	 
	 			do {
	 				b3 = data[i++];
	 				if (b3 == 61) {
	 					return buf.toByteArray();
	 				}
	 				b3 = base64DecodeChars[b3];
	 			} while (i < len && b3 == -1);
	 			if (b3 == -1) {
	 				break;
	 			}
	 			buf.write((int) (((b2 & 0x0f) << 4) | ((b3 & 0x3c) >>> 2)));
	 	 
	 			do {
	 				b4 = data[i++];
	 				if (b4 == 61) {
	 					return buf.toByteArray();
	 				}
	 				b4 = base64DecodeChars[b4];
	 			} while (i < len && b4 == -1);
	 			if (b4 == -1) {
	 				break;
	 			}
	 			buf.write((int) (((b3 & 0x03) << 6) | b4));
	 		}
	 		return buf.toByteArray();
	 	}
	 	/**
	 	 * 解密
	 	 * @param a
	 	 * @return
	 	 */
	 	public static String Base64decode(String str){
	 		String strc = str.substring(2, str.length()-2);
	 	   byte[] bt;
	        try {
	            bt = (new BASE64Decoder()).decodeBuffer(strc);
	            return new String(bt);//如果出现乱码可以改成： String(bt, "utf-8")或 gbk
	        } catch (IOException e) {
	            e.printStackTrace();
	            return "";
	        }
	 	}
	 	
	 	public static String Base64code(String str){
//	 		String strc = a.substring(2, a.length()-2);
	        try {
	        	byte[] bt = str.getBytes();
	        	String  code=(new BASE64Encoder()).encodeBuffer(bt);
	        	StringBuffer codes = new StringBuffer();
	        	codes.append(RandomString(2));
	        	codes.append(code);
	        	codes.append(RandomString(2));
	            return codes.toString();
	        } catch (Exception e) {
	            e.printStackTrace();
	            return "";
	        }
	 	}
	 	
	 	
		/** 产生一个随机的字符串*/
		public static String RandomString(int length) {
			String str = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
			Random random = new Random();
			StringBuffer buf = new StringBuffer();
			for (int i = 0; i < length; i++) {
				int num = random.nextInt(62);
				buf.append(str.charAt(num));
			}
			return buf.toString();
		}

		
	    
	    public static void main(String[] args) {
	    	String a =EncryptUtil.Base64code("sssdfwe");
	    	System.out.println(a);
//			Scanner scanner=new Scanner(System.in);
//	        /*
//	         * 加密
//	         */
//	        System.out.println("请输入要加密的内容:");
//	        String content = scanner.next();
//	        System.out.println("加密后的密文是:"+EncryptUtil.AESEncode(content));
//	       
//	        /*
//	         * 解密
//	         */
//	        System.out.println("请输入要解密的内容（密文）:");
//	         content = scanner.next();
//	        System.out.println("解密后的明文是:"+EncryptUtil.AESDncode(content));
	    }

}
